Comment 24 for bug 1902855

curtin has:

def multipath_assert_supported():
    """ Determine if the runtime system supports multipath.
    returns: True if system supports multipath
    raises: RuntimeError: if system does not support multipath
    """
    missing_progs = [p for p in ('multipath', 'multipathd')
                     if not util.which(p)]
    if missing_progs:
        raise RuntimeError(
            "Missing multipath utils: %s" % ','.join(missing_progs))

that's apparently not good enough, if multipath is disabled via kernel command line.